Relief for explosive-gas engines.



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RELIEF FOR EXPLOSIVB GA-S ENGINES.

APPLIUATION FILED JULY 11.1905.

l "alg WM W UNITED sTATEs PATENT oEEioE.

PET-Ear. G. HALL, Je.; or PHiLADELPHIA, PENNSYLVANIA.

RELIEF Fon ExPLoslvE- GAS ENGINES..

Specification of Letters atent.A

Patented May 22, 1906.

Application tiled Tuly`11-,19OE. Serial Nor269|193 .To a/Z whom) t con/cern:

-Be it known that I, PETER P. G. HALL, Jr.,

v a citizen of the United States, residing in the relief for explosivegas engines whereb the compression of the cylinder is relieve yand the engine more easily started.

struction, all as Will be hereinafter set forth.

`Figure' 1 represents a sectional view of the relief embodying my invention. Fig. 2 rep# resents a sectional view on a line substantially through the center of Fig. 1. Fig. 3 represents a' plan View of a portion ofthe device.

Similar numerals of reference indicate cor responding parts in the figures.

Referring to the drawings,v1 designates a relief for explosive-gas engines, consisting of the exhaust-valve 2, carried by the` valvestem 3, thelatter having the adjustable collar 4 thereon and being adapted to rest upon a lifter 5, the latter moving in a uide or collar 6, which is suitably supportel in the basev 7 of the engine or other suitable'place.

The end of the lifter is provlded with an antifriction device, such as a roller 8, which inthe present instance is mounted ona pin `9 within the yoke 10 on the lifter.

The valve 2 has aseat 11, thus controlling a passage between the interior of the cylinder 12 and the exhaust-passage 1,3, With which communicates the exhaust-pipe 14, a suitable spring 15 leaning against said collar 4 and the Walls of the cylinder and tending to seat vthe valve 2. v

16 designates the cam-shaft, having the exhaust-cam 17 thereon andso situated as to be in line with the lifter 5 and to actuate the same in itsrotation, said camshaft having an opening 18 land the slot 19 therein, While the cam at a suitable point is provided with a slot 20, adapted to be in register with the slot 19 in the cam-shaft.

2l designates `the auxiliary' or relief camshaft, the same in the present instance being seated and movable With'the cam-shaft 16,

. said shaft 21'having the relief-cam 22 attached thereto in anysuitable manner.

,'In'the drawings I have shown the same as screwed to the shaft, which latter isgprovided at its end with the handle 23, held place by in cross-section isoblong, whereby it engages in the slot in itsnormal position,as seen in Fig. 3, thus preventing unscrewing of' the same; but it may be removed by unscrewing the nut 24 and' taking off the nut, so that the when it can be unscrewed. n V

.In the relief-shaft 21are the depressions or recesses 25, into which is adapted to enter` It further consists of-novel details of conless relieved in some way, as the pressure is about ninety pounds to the square'inch. My

'without displacing any of the parts W 'ch operate in' the running of the engine. The exhaust-cam 17 as the shaft 16 rotates contacts at predetermined intervals with the valvelifter 5, thus raising the valve and permitting the gas, &c., to the requiredor necessary amount to pass. out through the exhaust 14, it being understood that this action takes place when the engine is in operation, the reief-cam 22 being in the position seen in Figs.

gine, the o erator will grasp the handle 23' and move t e relief-shaft 21 to the right, as seen in Fig. 1, whereby the auxiliary cam22 will enter the slot 20.in'the cam 17 and the l said cam 22 will be in a plane with the lifter 5, so that when the operator turns the shaft' 16 the two cams 17 and 22 will alternately strike the lifter 5 to raise the valve 2, so that the compression is relieved, the.. effect of which is evident. as the engine is properly started 4the auxiliary shaft 21 is pushed bach into its normal the above it will be understood that the 'caiii 17 and the lifter 5 are not disturbed with ree spect to their position.

` It will be evident that various changes. may be made by those skilled in the art vention, and I do not, therefore, desire to be limited in every instance to the exact construction herein shoe` 'e and described.

relief-shaft can be pushed onto the shaft `16` until the, earn is situated in the opening 18,

1 and 3. When it is desired to start the en- It will be seen that as soon position, (seen in Figs. 1 and 3,) and the -reliefcam Will thus not affect the valve 2. From the nut 2 4, it being noted that the relief-cam device is designed to relieve the com ressionm which Will come within the scope of my in- Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a device of the character described, an exhaust-valve for the cylinder, 'means for holding the same normally in closed position, a lifter for said valve, a caifshaft, a cam carried by said shaft and adapted to actuate said valve to open the same, an auxiliary shaft Within said cam-shaft and means secured to said auxiliary shaft Which can be moved into and out of alinement with said lifter for actuating said valve.

2. In a device of the character described, an exhaust-valve for the cylinder, means for normally holding the same in closed position, a lifter for said valve, a camsl1aft, a cam carried on said shaft and adapted to actuate Said valve, an auxiliary cam-shaft mounted in said first-mentioned shaft and movable therein, and a cam directly connected to said auxiliary shaft, said cam-shaft and cam having' slots into which said auxiliary cam is moved longitudinally by the movement of said auxiliary shaft.

3. vIn a device of the character described, an exhaust-valve for the cylinder, means for normally holding the same in closed position,

a lifter for said valve, a cam-shaft, a cam carried on said shaft and adapted to actuate said valve, zin-auxiliary cam-shaft mounted in said first-mentioned shaft and movable therein, a cam directly connected with said auxiliary shaft, said cam-shaft and cam hav- 

